“Once researchers established the vantage points for the eyewitness accounts, they turned to the mapping technology and aerial photography,” The Boston Globe explained. “They learned the eyewitnesses could not have seen the top of Gallows Hill from where they observed the executions, but they could see Proctor’s Ledge, located in between what is now Proctor and Pope streets.”

Now that the location of the hangings has been found a modest memorial for those who died is planned.